
#mycanvas{
	     height:500px;
         width:500px;
         position:absolute;z-index:-2;
}
#mydiv {
         height:50px;
         width:50px;
         z-index : 100;
         background-color: #7FFFD4;
         border: 1px solid red;
      }
#canvas{
	 position:absolute;z-index:-2;
}